Wide-angle lens assembly
View Patent ↗A wide-angle lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens is with negative refractive power and includes a concave surface facing the image side. The second lens includes a concave surface facing the object side. The third lens includes a convex surface facing the image side. The fourth lens includes a convex surface facing the object side. The fifth lens includes a concave surface facing the image side. The sixth lens is a biconvex lens with positive refractive power. The second lens and the third lens are cemented to form a first cemented lens with positive refractive power. The fourth lens and the fifth lens are cemented to form a second cemented lens with positive refractive power.
1. A wide-angle lens assembly, comprising sequentially from an object side to an image side along an optical axis:
a first lens with negative refractive power and including a concave surface facing the image side;
a second lens with refractive power and including a concave surface facing the object side;
a third lens with refractive power and including a convex surface facing the image side;
a fourth lens with refractive power and including a convex surface facing the object side;
a fifth lens with refractive power and including a concave surface facing the image side;
a sixth lens which is a biconvex lens with positive refractive power;
wherein the second lens and the third lens are cemented together to form a first cemented lens with positive refractive power; and
the fourth lens and the fifth lens are cemented together to form a second cemented lens with positive refractive power;
the wide-angle lens assembly satisfies:
0.2≤ TL/θ m ≤0.4,
wherein TL is an interval in mm from an object surface of the first lens to an image plane along the optical axis and θ m is a half maximum field of view in degree for the wide-angle lens assembly.
2. The wide-angle lens assembly as claimed in claim 1 , wherein the second lens is with negative refractive power.
3. The wide-angle lens assembly as claimed in claim 2 , wherein the second lens further comprises a convex surface facing the image side.
4. The wide-angle lens assembly as claimed in claim 2 , wherein the second lens further comprises a concave surface facing the image side.
5. The wide-angle lens assembly as claimed in claim 1 , wherein the third lens is with positive refractive power.
6. The wide-angle lens assembly as claimed in claim 1 , wherein the fifth lens is with negative refractive power.
7. The wide-angle lens assembly as claimed in claim 1 , wherein the fourth lens is with positive refractive power and further comprises a convex surface facing the image side.
8. The wide-angle lens assembly as claimed in claim 1 , wherein the sixth lens is an aspheric lens.
9. The wide-angle lens assembly as claimed in claim 1 , further comprising a stop disposed between the third lens and the fourth lens.
10. The wide-angle lens assembly as claimed in claim 1 , wherein the first lens satisfies:
−3≤ f 1 /R 12 ≤−1.67,
wherein f 1 is an effective focal length of the first lens and R 12 is a radius of curvature of the concave surface of the first lens.
11. The wide-angle lens assembly as claimed in claim 1 , wherein the wide-angle lens assembly satisfies:
0.7≤ ER 11 /f≤ 1.6,
wherein ER 11 is an effective radius of an object side surface of the first lens and f is an effective focal length of the wide-angle lens assembly.
12. The wide-angle lens assembly as claimed in claim 1 , wherein the wide-angle lens assembly satisfies:
30≤ Vd 2 −Vd 3 ≤50,
wherein Vd 2 is an Abbe number of the second lens and Vd 3 is an Abbe number of the third lens.
13. The wide-angle lens assembly as claimed in claim 1 , wherein the wide-angle lens assembly satisfies:
30≤ Vd 4 −Vd 5 ≤50,
wherein Vd 4 is an Abbe number of the fourth lens and Vd 5 is an Abbe number of the fifth lens.
14. A wide-angle lens assembly, comprising sequentially from an object side to an image side along an optical axis:
a first lens with negative refractive power and including a concave surface facing the image side;
a second lens with negative refractive power and including a concave surface facing the object side and a convex surface facing the image side;
a third lens with positive refractive power and including a concave surface facing the object side and a convex surface facing the image side;
a fourth lens with positive refractive power and including a convex surface facing the object side;
a fifth lens with refractive power and including a concave surface facing the image side;
a sixth lens which is a biconvex lens with positive refractive power;
wherein the second lens and the third lens are cemented together to form a first cemented lens with positive refractive power;
the fourth lens and the fifth lens are cemented together to form a second cemented lens with positive refractive power; and
the wide-angle lens assembly satisfies:
0.2≤ TL/θ m ≤0.4,
wherein TL is an interval in mm from an object surface of the first lens to an image plane along the optical axis and θ m is a half maximum field of view in degree for the wide-angle lens assembly.
15. The wide-angle lens assembly as claimed in claim 14 , wherein the first lens further includes a convex surface facing the object side.
16. The wide-angle lens assembly as claimed in claim 14 , wherein the first lens further includes another concave surface facing the object side.